Question explored with the scientific record
does the US childhood vaccine schedule increase the risk of autism spectrum disorder
The evidence retrieved does not contain a single study that directly tests whether the US childhood vaccine schedule increases the risk of autism. That gap is the finding.
The studies you gave me are about screening questionnaires [1, 4], gesture use in toddlers [2], brain scans [5], playground behavior [6], sulforaphane treatment [7], social skills training [8], venlafaxine [9], a pneumococcal vaccine's reactogenicity [10], and Italian forum posts [12]. None of them compare autism rates in vaccinated versus unvaccinated children. One narrative review from 2025 argues that vaccines cause autism and claims the Bradford Hill criteria are met [11], but it is a review of contested sources published in a journal called the International Journal of Vaccine Theory, Practice, and Research, not a controlled study. It offers no new data.
The most informative study design—comparing a large, prospectively followed group of vaccinated children to a similarly followed group of unvaccinated children, tracking autism diagnoses over years—is absent from this evidence base. Without that comparison, no claim about causation or even association can be grounded. The evidence here does not support the hypothesis, but it also does not refute it. It simply does not address it.
My call: the retrieved evidence does not answer whether the schedule increases autism risk. Confidence: not clear, because the question was never studied in the material provided.
Sources examined 12
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When does the Autism Spectrum Screening Questionnaire (ASSQ) predict autism spectrum disorders in primary school-aged children?
This study evaluates the predictive validity of the Autism Spectrum Screening Questionnaire (ASSQ) for identifying autism spectrum disorders in primary school-aged children, highlighting the importance of using both parents' and teachers' ratings for effective screening.
DOI: 10.1007/s00787-009-0044-5 -
Brief Report: Gestures in Children at Risk for Autism Spectrum Disorders
This study investigates the use of gestures in 42 children at risk for Autism Spectrum Disorders (ASD) at 13-15 months of age and finds that those who later meet criteria for autism exhibit significantly fewer gestures compared to those who meet criteria for autism spectrum or d…
DOI: 10.1007/s10803-015-2390-0 -
Pervasive Developmental Disorder and Obstetric Complications in Children and Adolescents with Tuberous Sclerosis
This study investigates the relationship between obstetric complications and the phenotypic expression of autism spectrum disorders in children with tuberous sclerosis, finding that while children with tuberous sclerosis experienced more obstetric complications than their unaffe…
DOI: 10.1177/1362361301005003002 -
Validation of the Autism Spectrum Screening Questionnaire in a Total Population Sample
This study validates the Autism Spectrum Screening Questionnaire (ASSQ) as an effective screening tool for autism spectrum disorders (ASD) in a general population of 7-9 year-olds, demonstrating high sensitivity and specificity when combining parent and teacher assessments.
DOI: 10.1007/s10803-008-0609-z -
Reduced Neural Habituation in the Amygdala and Social Impairments in Autism Spectrum Disorders
This study investigates amygdala habituation in individuals with autism spectrum disorders, revealing reduced habituation to neutral facial stimuli and its correlation with social impairments.
DOI: 10.1176/appi.ajp.2008.07101681 -
Examining playground engagement between elementary school children with and without autism spectrum disorder
This study investigates the playground engagement and peer interaction behaviors of elementary school children with and without autism spectrum disorder, revealing significant differences in their social behaviors during recess.
DOI: 10.1177/1362361315599468 -
Sulforaphane treatment of autism spectrum disorder (ASD)
This study demonstrates that sulforaphane treatment significantly improves behavioral symptoms in young males with autism spectrum disorder (ASD) in a placebo-controlled, double-blind, randomized trial.
DOI: 10.1073/pnas.1416940111 -
Social Skills Training for Young Adults with High-Functioning Autism Spectrum Disorders: A Randomized Controlled Pilot Study
This study evaluates the effectiveness of the PEERS social skills intervention for young adults with high-functioning autism spectrum disorders, demonstrating significant improvements in social skills, social responsiveness, and reductions in loneliness.
DOI: 10.1007/s10803-011-1350-6 -
Venlafaxine in Children, Adolescents, and Young Adults With Autism Spectrum Disorders: An Open Retrospective Clinical Report
This open retrospective clinical report evaluates the efficacy of venlafaxine in treating core symptoms of autism spectrum disorders and associated features of ADHD in a small cohort of patients, finding that it was well tolerated and led to significant improvements in various s…
DOI: 10.1177/088307380001500214 -
Safety and Reactogenicity of the 10-Valent Pneumococcal Non-typeable Haemophilus influenzae Protein D Conjugate Vaccine (PHiD-CV) When Coadministered With Routine Childhood Vaccines
This study evaluates the safety and reactogenicity of the 10-valent pneumococcal non-typeable Haemophilus influenzae protein D conjugate vaccine (PHiD-CV) when coadministered with routine childhood vaccines, comparing it to the licensed 7-valent pneumococcal conjugate vaccine (7…
DOI: 10.1097/INF.0b013e318199f62d -
Evidence Showing Childhood Vaccinations Are Causing Autism and Other Intellectual Disabilities
A controversial narrative review arguing that childhood vaccinations cause autism and other intellectual disabilities, claiming Bradford Hill criteria are met and criticizing safety testing and regulatory oversight.
DOI: 10.56098/xx404j13 -
Arguments and sources on Italian online forums on childhood vaccinations: Results of a content analysis
This study analyzes arguments and information sources regarding childhood vaccinations in Italian online forums, revealing a predominance of anti-vaccination sentiments and the need for strategies to counter misinformation.
DOI: 10.1016/j.vaccine.2015.11.007